Suppose that I have 4 groups means:18,13,16,10, and 4 standard deviation:10,9,9,8, and α=0.05，β=0.1, how many samples do I need?
I'm trying to calculate the sample size using
pwr package in R.
But I don't know how to calculate the
Also, if I use
power.anova.test, I don't know how to calculate the
Anyone can help? Thank you very much!